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Share-Based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation | Share-Based Compensation Share-Based Compensation We utilize share-based compensation in the form of stock options, restricted stock, and restricted stock units. The following table summarizes the components of share-based compensation expense for the three and nine months ended September 30, 2023 and 2022 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Research and development | $ | 103 |  |  | $ | 271 |  |  | $ | 517 |  |  | $ | 631 |
General and administrative | 203 |  |  | 769 |  |  | 1,048 |  |  | 1,537 |
Total share-based compensation expense | $ | 306 |  |  | $ | 1,040 |  |  | $ | 1,565 |  |  | $ | 2,168 |
Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards were expected to be recognized at September 30, 2023 were as follows (in thousands):
| Stock Options |  | Restricted Stock Units |  | Restricted Stock
Unrecognized compensation cost | $ | 221 |  |  | $ | 161 |  |  | $ | 483 |
Expected weighted-average period in years of compensation cost to be recognized | 1.85 |  | 1.10 |  | 1.69
Total fair value of shares vested and the weighted average estimated fair values of shares granted for the nine months ended September 30, 2023 and 2022 were as follows (in thousands):
| Stock Options |  |
| Nine Months Ended September 30, |  |
| 2023 |  | 2022 |  |  |  |
Total fair value of shares vested | $ | 1,001 |  |  | $ | 853 |  |  |  |  |
Weighted average estimated fair value of shares granted | $ | 2.10 |  |  | $ | 1.23 |  |  |  |  |
Valuation Assumptions The fair value of stock options at the date of grant was estimated using the Black-Scholes option pricing model. The expected volatility is based upon historical volatility of the Company’s stock. The expected term for the options is based upon observation of actual time elapsed between date of grant and exercise of options for all employees. The expected term for the warrants is based upon the contractual term of the warrants.

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